Agrilus hyperici, the St. John's wort root borer, is a species of jewel beetle.

It is used as an agent of biological pest control against common St. John's wort (Hypericum perforatum) in areas where it is a noxious weed or invasive species.

[1] The female deposits eggs low on the stem of the St. John's wort plant in July and August.

The beetle is known to attack the similar plant goldwire (Hypericum concinnum) in California, but it does not appear to have a destructive impact on this species.

[1] Its association with Hypericum perforatum has been known for a long time and it was first introduced to the United States for the purposes of biocontrol in 1950, in California.